Kind of funny how different UA approach is to DL. DL I had a delay, and cancelled/refunded my ticket and flew another carrier. DL proactively called me after and asked if there was anything they could do. I said nope, I've already booked myself on another carrier. DL agent said, ok i'm going to send you a $100 check.
This happened around 1am and I thought I was dreaming or a scam so let him say my address first. Thought for sure I had misunderstood and maybe it was $100 voucher, or $100 in skypesos, or something, but no. $100 check arrived when they had already refunded my ticket (and knew as such).